Steam-stamp for crushing ore



(No Model.) 8 Sheets-Sheet 1.

E.D. LEAVITT, Jr.

STEAM STAMP POR @RUSHING ORB. No. 275,224. P nted Apr.3, 1883.

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Indenor:

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(No Model.) s sheets-sheet 2. E. D. LEAVITT, Jr. .STEAM STAMP FORGRUSHING ORB.

,iPatentnd Apr. 3, 1883.

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Witnesses: W@ ma? N. PETERS. Pmivthxnhw. Washington.

(No Model.) Y 8 Sheets--Sheet 3. E. D. LEAVITT, Jr.

STEAM STAMP PGR GRUSHING ORE.4

No. 275,224. Patented Apr.3,1883.

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(No Model.) 8 Sheets-Sheet 4.

^ E. D. LEAVITT, Jr.

STEAM STAMP PDR GRUSHING ORE.

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E. D. LEAVITT, Jr.

lSTEAM STAMP POR GRUSHING ORE. v No. 275,224. Patented Apr.3,1883.

Wibwsses: Inventor:

N, PETERS, Puma-Limognphen wnmngcon. D. CA e (No Modem s sheets-sheen e.E. D. LEAVITT, Jr.

STEAM STAMP POR GRUSHING ORB.

N0. 275,224. Patented Ap1.3,1883.

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STEAM STAMP POR GRUSHING ORB.

No. 275,224. l

. Patented Apr. 3,1883.

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E. D. LEAVITT, Jr. STEAM STAMP PoR GRUSHING ORE.

Pahtenzxt-ed Apr. 3, 1883.

Witnesses: ffm@ (92 .Inventor y@ "y f 105%..

UNITED STATES PATENT OFFICE.

ERASMUS D. LEAVITT, JR., OF CAMBRIDGEPORT, MASSACHUSETTS.

STEAM-STAMP FOR CRUSHING ORE.

SPECIFICATION forming part of Letters Patent No. 275,224, dated April 3,1883.

Application med .Tiny 12,1992.

To all whom it may concern Be it known that I, ERAsMUs D. LEAVITT, J r.,of Cambridgeport, in the county ot Middlesex and State of Massachusetts,have invented certain new and useful Improvements in Steam-Stamps forCrushing Ores, of which the following, taken in connection with theaccompanying drawings, is a specification.

My invention relates to that class of orestamps in which the stamp orhammer is operated by the direct application of steam to the hammer-rod,or a piston or pistons secured thereto, and is an improvement upon thewellknown Ball stamp; and it consists, first, in the employment, asameans of operating the stamp or hammer, of dierential steam-cylindersand pistons arranged in axial line with each other, in combination withmeans of maintaining the maximum pressure beneath the smaller piston ata uniform standard, and

means of intermittently admitting steam to and exhaustingit from thechamber above the larger piston, as will be more fully describedhereinafter.

It further consists in the combination ofthe smaller cylinder, areceiver having free communication with said cylinder, and anautomatically-operating valve arranged to control the admission of steamto said receiver, and thus maintain the maximum pressure therein at auniform standard.

1t further consists in a novel construction of the valve-gear, wherebythe time of opening and closing the valves may be varied at will whilethe machine is in operation.

It further consists in the combination, with the dierential cylindersand pistons, of a dash-pot located beneath and adapted to receive one ofsaid pistons, and cushion it at the lower end of its downward movement,as will be described.

It further consists in the combination, with the stamp-rod and means ofreciprocating it, of a dash-pot as a means of limiting its upwardmovement and a dash-pot for limiting its downward movement.

It further consists in the combination, with a vertically-reciprocatingstamp or hammer, a mortar or stamping-chamber, and a steamcylinder andpiston adapted to operate said stamp or hammer, of a frame-work forsulp- (No model.)

portingthe steam-cylinder, made pyramidal in form and dividedhorizontally into three sections or stories, and having its uppersection cast in one piece and its lower section made in two or morepieces, the whole being so united as to be self-supporting andindependent of the structure of the building in which it is placed, andso that one portion ot' the lower section may be removed to permit theremoval of the mortar without endangering the rest of the structure.

It further consists in the employment of a frictional clamping deviceapplied to the valve-stem to prevent any undue movement of the valve.

It further consists in the combination ot' the large steam-cylinderprovided with a jacketcasing cast therewith, but separated therefrom atone end, an annular expansion ring or plate connecting said jacket withthe cylinder proper, and a smaller cylinder cast separate from andbolted to said larger cylinder in axial line therewith.

It further consists in a novel construction of the head ofthe lowerorsmaller cylinder, whereby said head is made to serve the purpose ofadash-pot to limit the downward movement 0f the piston of said cylinder.

It further consists in the combination of differential cylinders andpistons with means of maintaining a vacuum between said pistons, as willbe more fullyvdescribd.

It further consists in certain details of construction and arrangementof the parts, which will be readily understood by reference to thedescription of the drawings, and to the claims to be hereinafter given.

Figure 1 of the drawings is a side elevation ot' my improved stamp witha portion of theframing in section. Fig. 2 is a sectional frontelevation of the same. Fig. 3 is a front elevation of thesteam-cylinders and the upper section of the frame, with the valve-gearmounted thereon, drawn to an enlarged scale. Fig. 4 is a sectional planof the upper section of the frame, the cutting-plane being on line l lon Fig. 3. Fig. 5 is a horizontal section online 2 2 on Fig. 3. Fig. Gisa section of one corner of said upper section of the frame o'n line 3 3on Fig. 3. Fig. 7 is a section on line 4 4 on Fig. 2. Fig. 8 isahorizontal section of the framing on line 5 5 on Figs. 1 and 2. Fig. 9is a central vertical section of the steam-cylinders on line -6 G onFig. 10. Fig. 10 is a horizontal section on line 7 7 on Fig. 9. Fig. 11is a. horizontal section on line 8 8 on Fig. 9. Fig. 12 is a partialvertical section on line 9 9 on Fig. 10, drawn to a still larger scale.Fig. 13 is a partial vertical section of the steam-cylinders, showingthe manner of applying the expansion ring or plate, drawn to the samescale as Fig. 12. Fig. 14 is a vertical section of the valve-gear online 10 10 on Fig. 3. Figs. 15, 16,17, 18, 19, and 20 are detail viewsof parts of the valve-gear, to be hereinafter referred to. Y

A A are two metal bed-sills resting upon and secured to a suitablefoundation, of which the line t indicates the upper surface, and B B area series of timbers resting at their ends upon said bed-sills, andtogether forminga table or platform to receive the metallic bed C' ofthe morta-r C.

D D are two hollow metallic .beams, arranged one upon each side of thewooden platform B B, and resting by their ends upon the bed-sills A Aand firmly secured thereto by bolts orrivets. (Not shown.) Four hollowmetallic columns, E E, are erected upon and secured to the upper surfaceof the Vbeams D D in inclined positions, so that each column forms onecorner of the lower section ot' a pyramidal structure composed of threedivisions or sections placed one above the other, and supporting at itstop the steam-cylinders F and F', as shown.

The middle or central section ot' the pyramidal frame is composed of twoside frames, G G, connected together by the tie-girts G' and G2, inwhich are formed the bearings For the stamp-shaft b, and provided ateach end with flanges, by means of which and corresponding tianges uponthe other sections, its lower end is firmly secured to the tops ot' thecolumns E, and its upper end is in like manner secured to the lower endof the upper section, H, which is cast entire in one piece, as shown inFigs. 3, 4, and 5.

The mortar proper, C, is made. circular in pian, and the die c, ring c',and lining c2 are all constructed and arranged substantially as intheBall stamp; but the upper part ofthe mortar or the screen-chamber G2is made cruciform in plan, instead of rectangular, as is the Ballscreen-chamber, the outer wall of each arm ot' the cruciform chamberbeing inclined, and provided with a perforated screen-plate d,th roughwhich the pulp or crushed ore is discharged into the hopper or trough e,one of which is applied to each of said inclined sides ot' thescreen-chamber, as shown in Fig. 2.

l is the stamp or hammer, secured to the stamp-shaft b, and havingsecured thereto the shoe I' in a well-known manner.

Upon the top ofthe screen-chamber and surrounding the stamp-shaft b isan annular pipe, f, provided upon its inner periphery with a seriesoforifices and upon its upper side with two cone-like or funnel-shapednozzles, through which water may be introduced into the Inortar throughsuitable pipes. (Not shown.)

The stamp-shaft b has its bearings in the tie-girts G' and G2, and hassecured to its upper end the piston J, which, near the upper end of itsupward stroke, enters the inverted dash-pot J', secured to the underside of the upper sect-ion ofthe pyramidal frame, by means ofwhich theupward stroke of the stamp and its stem is limited without serious shockto the machinery.

F is acylinder', open at both ends, and connected at or near its upperend by an annular ange or head with the inclosing-casing F,"

thereto, near its upper end, the casing F4,A

which is bolted by its lower end to the casing F2, and connected by theannular expansionplatef4 to the lower end of the'cylinder F', as shownin Figs. 2, 9, and 13.

K and K' are two pistons of different diameters, both mounted upon thepiston-rod g, and fitted to and arranged to reciprocate in the cylindersF and F', respectively, said pistons being maintained at the properdistance apart by the sleeve g', interposed between them and surroundingthe rod g, as shown in Fig. 2.

L is a steam-gate' through which steam is admitted to the steam-chest L'of the cylinder F', and h is the steam-valve by which the admission ot'steam to the cylinder F', above the piston K', is controlled. When thesteam above the piston K' has accomplished its work of forcing thepistons K and K', the piston-rod g, the stamp-shaft b, and stamp 1downward to give the desired blow, the steam escapes through theexhaust-port andthe valve h' into the pipe L2, through which it passesto the condenser M. The pipe L2 is connected by the pipe L3 with thechamber between the two pistons K and K', for the purpose of maintaininga vacuum in said chamber. The chamber N, between the cylinder F and theouter casing, F2, and the chamberbeneath the piston K, are supplied withsteam at a constant pressure by means ofan automatic valve, N'. (Shownin Fig. 2.)

The valve N', not being ot'my invention, is not shown in detail in thedrawings, and need not be described here further than to say that thevalve which I have successfully used in this connection is shown anddescribed in Letters Patent No. 249,060, granted to Joseph E. Watts,April 12,1881, which operates to maintain a uniform maximum pressurebeneath the piston K; or, in other words, the valve N' IOS IIO

IIS

so regulates the admission of steam to the tions of which projectthrough slots ando',

chamber N and the space beneath the piston K that the` maximum pressuretherein is uniform, regardless of what may be the fluctuations ofpressure above the piston K'.

0 is an air-pump for discharging the air and water from the condenser M.

The rod g is connected to the stamp-shaft b by a swivel-connection, sothat the stem b and stamp I may be revolved by means of a flangedpulley, i, mounted upon the sleeve t" and a suitable belt leadingtherefrom to any suitable driving-pulley. The sleeve i' surrounds thestem b between the tie-girts G and G', and is connected to said stem bymeans of suitable keys and keyways, so that as said sleeve is revolvedthe stamp-shaft b and the stamp l must revolve therewith, while at thesame time lit is free to he moved endwise through said sleeve as thestamp rises and falls.

The short serrated section of `cylinder f3, upon the head f', serves asadash-pot to limit the ldownward movement of the piston K, the steam`contained therein serving as an elastic cushiong-.to receive the blow,the serrations formed in the upper end of said short cylinder servingasfports for the admission of steam to the cylinderF, and by virtue oftheir peculiar shape to gradually check the downward movement of thepiston and prevent undue shock to the cylinder.

P, P', and P'are the several floors of the building through' which thepyramidal frame extends, as shown.

Q is the hopper or chute through which the ore is supplied to the mortarin a well-known manner.

R is a frame or bracket secured to the front side of the cylinder F',and supporting thereon the pillow-blocks R and R2, in which is mountedthe shaft S, upon one end ot' which is rmly secured the pulley S', bymeans of which and a suitable belt leading' therefrom to a drivingshaft(not shown) said shat'tS may berevolved.

The shaft S has formed in its periphery two keyways or spline-grooves,jandj', extending spirally partially around said shaft in oppositedirections, 'as shown in Fig. 18, in each of which is tted a curved key,k, which is provided with an outwardly-projecting lip, the sides of,whichv are parallel with the axis of said shaft, and the outer edge ofwhich is provided with the lugs l l to embrace the grooved collar T orT', as shown in Figs. 19 and 20. The shaft S has rmly secured thereon,so as to revolve therewith, the two annular or inside face-cams, U andU', arranged respectively to open the steam-valve h and to close theexhaust-valve h' through the medium, in the one case, of the truck m,lever V, yoke W, and valve-rod n, and, in the other, of the truck m',lever V', yoke W', .and valverod n'. Within these annular cams U and U'are two face-cams, each provided with a long hub,-X or X', and mountedupon theshaft S, and connected thereto, 'so'a's to revolve therewith,bymeans of the keys k, the outer porrespectively, which are cutlongitudinally of said hubs, as shown in Figs. 19 and 20, so that saidcams and their-hubs X and'X' may be moved to a limited extent aroundsaid shaft, while said shaft is in motion, for the purpose of varyingthe time of closing the steam and opening the exhaust valves,respectively, which is done by said face-cams acting upon the oppositesides of the same trucks, m and m', that are acted upon by the annularcams U and U' to open the steam and close the exhaust valves.

The lever V for operating the steam-valve h is a two-armed bent or elbowlever, the upright arm of which is forked so as to embrace the outer barof the yoke W, and is pivoted thereto at m2, and thev movable end of theother arm has mounted upon a suitable journal set therein the truck m,all as shown in Figs. 3 and let.

The lever V', which operates the yoke W', y

and through it the exhaust-valve h', is a single-armed lever slottedupon its inner face so as to embrace the outer bar ofv the yoke W', andprovided with the slotted projection V2, in which is mounted the rollfm' upon the pin m3, which also serves as the pivotal connection betweenthe lever V' and the yoke W', as shown in Figs. 15, 16, and 17.

A' and A2 are forked elbow-levers provided at their forked endswithtrucks or studs to engage with the peripheral grooves in the collars Tand T', respectively, and having pivt-A ed to their opposite ends thelinks a.' and a", respectively, the lower ends of which are in turnpivoted to the screw-rods b' and b2, fitted to the hand-nuts d' and d2,and guided at the their upper .ends'in the slides e' and e2, re-

.spectively,`as shown in Fig. 3. By turning the hand-nut d' the collar TWill be moved along the hub X, carrying with it the key k, which, movingin `the spiral groove j in the shaft S, will cause the hub X and its camto be moved around the shaft S, so as to vary the angular distancebetween the throw of said cam, which closes the valve h, and the throwof the cam U, which opens said valve, By turning the hand-nut d' aprecisely similar result is produced upon the hub X' and lits cam as ameans of varying the movements of the exhaust-valve h'.

A grooved-collar, b3, is firmly secured upon the rod g, and engages withthe forked lever b4 to vibrate it as the rod g moves up and down.

The lever b4 is connected by the link g2 to the lever g3, the oppositeend of which is pivoted to the rod h2, arranged to slide vertically inbearings, and provided at its upper end with means ofconnection with acord for operating a steam-indicator. (Not shown.)

The valves h and h' are prevented from bei'ng thrown too far by theiroperating cams by mounting their stems ory the connecting portions ofthe yokes W and W' in the frictionbearings Y, as shown in Fig. 14.

Upon the inner corner of each of the columns E of the lower section ofthe pyramidal frame-work is securely bolted a bracket, E', having at itsinner edge two faces at right angles to each other, which, with thefixed lips i2 i2 and the detachable lips 3713, form vertical grooves,into each of which are tted two pieces of wood, i4 and i5, against thelatter ot' which the planed surfaces i6 i6, formed upon the sides of`the mortar, bear to hold said mortar in position and at the same timepermit it to move vertically as the blow of the descending stamp isreceived upon the die c.

By constructing the pyramidal frame in sections, as described, and thelower section of the four columns E and brackets' E', the mortar orscreen chamber may be removed for repairs by removing three of thebrackets E' and Letters Patent of the United States, is-

1. The combination, in a steam -operated stamp, of a pair ofdifferential steam-cylinders in axial line with each other, means ofmaintaining a constant pressure beneath the piston of the smallercylinder, means of intermittently admitting steam to and exhausting itfrom above the piston of the larger cylinder, and a stamp-shaft carryingat its lower end a stamp, die, or hammer, substantially as described. 2.The cylinder F, the casing F4, surrounding saideylinder and inclosing anannular chamber, openings or ports connecting said annular chamber withthe interior ot' said cylinder, and an automatic valve adapted tocontrol the admission of steam to said chamber and cylinder andmaintainthemaximum pressure therein at a uniform standard, substantiallyas described.

`3. The cam-shaft S, provided with the spiral groove i',in combinationwith cam Utixed thereon, the slotted hub X and its cam, the key 76 thecollar T,and means of' moving said collar along said hub X,substantially as and for the purposes described.

4. The combination of the shaft S, provided with the spiral groove j,the cam U, slotted hub and cam X, key 7c, collar T, forked elbowleverA', link a', screw-rod-b, and hand-nut d', all arranged and adapted tooperate substantially as and for the purposes described.

5. The combination of the differential cylinders F and F', the pistons Kand K', and the dash-pot f3, all constructed, arranged, and adapted tooperate substantially as and for the purposes described.

6. VIn a steam-operated ore-stamp, the combination, with the stamp-shaftand a steampistou for operating it., ot' a dash-pot adapted to receivesaid piston and limit its downward stroke by a cushion of steam, and asecond and inverted dash-pot surrounding said stampshaft, but removedfrom the steam-cylinder and adapted to limit the upward movement of saidshaft by means of a cushion of air, substantially as and for thepurposes described.

7. 1n combination with a vertically-reciprocating stamp or hammer, amortar or stamping-chamber, and a steam-cylinder and piston foroperating said stamp or hammer, an iron frame-work for supporting saidcylinder and the other operative parts of the machine, made pyramidal inform and divided horizontally into three sections or stories, the uppersection being cast in one piece and the lower section in two or morepieces, the whole being so united as to be self-supporting andindependent of the building in which it is placed, substantially asdescribed.

8. In a steam-stamp, a pyramidal frame divided horizontally into two ormore sections or stories, the upper section or story of which v is castin one piece and the lower section in two or more pieces, one of whichmay be removed to permit the removal of the mortar, in combination withbrackets or guides secured to said lower section and adapted to supportor guide the mortar in its slight vertical movements, substantially asdescribed.

9. The combination of the cams U and X, lever V, yoke W, valve h and itsrod, and the friction-bearing Y, all arranged and adapted to operatesubstantially as described.

10. The combination of the diferential cylinders F and F', the annularcasingF, cast in one piece with the cylinder F, and the annulareXpansion-platef4, all constructed, united, and adapted to operatesubstantially as and for the purposes described.

11. In combination with thecylinder F, open at its bottom and providedwith the annular casing F2, the head f', provided with the shortcylinderf3, open at its upper end, and suitable openings for the passageof steam between the contiguous ends of said cylinders F and f3,substantially as described.

12. The combination of twodierential cylinders arranged in axial linewith each other, two differential pistons mounted upon a commonpiston-rod, and means ot' maintaining a vacuum between said pistons,substantially as described.

13. The combination of the screen-chamber O2, provided with the surfacesi6, the brackets E', provided with the guideways i2, and the columns E,all arranged and adapted to operate substantially as described.

14. The dash-pot f3, provided with a series of V-shaped notches in itsupper edge, substantially as described.

ERASMUS D. LEAVITT, JR.

Witnesses:

DECoURoY MAY, Gr. E.WH1TNEY.

IOO

IOS

